We look at the division of 604539 by 91 
The aim is to understand the frequency of 91 in 604539.

Step 1:
The number 91 fits into 6 0 times, leaving a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Fetch the next digit (0) from the dividend, attach it to 6 and continue: 60 / 91

Moving on to step 2:
When dividing 60 by 91, we get 0 with a remainder of 60.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 60 to get 60.
Include the next digit (4) from the dividend after 60, then repeat: 604 / 91

Step 3:
When dividing 604 by 91, we get 6 with a remainder of 58.
Write down 6 as next digit of the result. 
Result so far: 6.0
Deduct 546 from 604 and we're left with 58.
Take the next digit (5) from the dividend and append it to 58, then repeat: 585 / 91

On to step 4:
91 can be fit into 585 6 times, resulting in a remainder of 39.
Use 6 as the next digit of our solution. 
Result so far: 66.0
Deduct 546 from 585 and we're left with 39.
Grab the next digit (3) from the dividend, add it to 39, then carry on: 393 / 91

On to step 5:
The number 91 fits into 393 4 times, leaving a remainder of 29.
Write down 4 as next digit of the result. 
Result so far: 664.0
Subtracting 364 from 393 leaves us with 29.
Grab the next digit (9) from the dividend, add it to 29, then carry on: 299 / 91

Advancing to step 6:
When dividing 299 by 91, we get 3 with a remainder of 26.
Use 3 as the next digit of our solution. 
Result so far: 6643.0
Subtracting 273 from 299 leaves us with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Going ahead to step 7:
91 goes into 260 2 times with a remainder of 78.
Put 2 as the next digit of the answer. 
Result so far: 6643.2
The remainder is 78 after subtracting 182 from 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Advancing to step 8:
780 divided by 91 is 8 with a remainder of 52.
Record the quotient 8 as the next digit in the result. 
Result so far: 6643.28
Deduct 728 from 780 and we're left with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Moving on to step 9:
520 divided by 91 is 5 with a remainder of 65.
The next digit of our result is 5. 
Result so far: 6643.285
Subtracting 455 from 520 leaves us with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Let's proceed to step 10:
650 divided by 91 is 7 with a remainder of 13.
Write down 7 as next digit of the result. 
Result so far: 6643.2857
If we subtract 637 from 650, we get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

On to step 11:
When dividing 130 by 91, we get 1 with a remainder of 39.
The next digit of our result is 1. 
Result so far: 6643.28571
Deduct 91 from 130 and we're left with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Advancing to step 12:
390 divided by 91 is 4 with a remainder of 26.
The next digit of our result is 4. 
Result so far: 6643.285714
Subtracting 364 from 390 leaves us with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Advancing to step 13:
91 can be fit into 260 2 times, resulting in a remainder of 78.
The number 2 becomes the next digit in our result. 
Result so far: 6643.2857142
If we subtract 182 from 260, we get 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Moving on to step 14:
780 divided by 91 is 8 with a remainder of 52.
Record the quotient 8 as the next digit in the result. 
Result so far: 6643.28571428
The remainder is 52 after subtracting 728 from 780.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

In conclusion, the division gives 6643.28571428 with a balance of 5.2e-08.